The current aMember file protection feature is based on the files being uploaded to the site's server. If the files that need protected, are large and you expect a large bandwidth requirement to serve up the files, a content distribution network (CDN) solution such as Amazon's S3 should be considered. The maximum file size that can be uploaded to a given server is found on aMember's Version Information page. Note that Amazon S3 integration is on aMember's Road Map for the next major release (4.2).